ESP32 UART Bridge Fix (Flash ESP32 via Pico)#18
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* Auto-Reset Logic: Implemented the specific DTR/RTS signal mapping required for direct (transistor-less) Pico-to-ESP32 connections.
* Protection Window: Added a 5-second ignore window for DTR/RTS signals upon entering UART mode. This prevents the OS from accidentally knocking the ESP32 out of its manual bootloader state when the COM port
is first opened.
* High-Speed Stability: Moved UART handling to a high-priority polling loop on Core 1 and added volatile memory protection to prevent data loss at high baud rates.
* Auto-Exit: Restored the logic to detect the PROGRAMMING_COMPLETE flag so the Pico reboots back to controller mode automatically.
Updated declarations to expose the new bridge control and callback functions.
Implementation: Overrode the new CDC callbacks to pass signal data directly into the core bridge logic.
Implementation: Overrode the new CDC callbacks to pass signal data directly into the core bridge logic.
Improved Timing: Refined the enter_programming_mode() sequence to hold the Boot pin (GPIO0) LOW for a full 500ms after reset, ensuring the ESP32 reliably catches the bootloader state.
Performance: Increased CDC TX/RX buffer sizes from 256 to 1024 bytes. This is required to prevent "Sync" errors when flashing at high speeds (e.g., 921600 baud).
Infrastructure: Linked the global TinyUSB CDC events (Line State/Coding) to the internal driver system so the UART bridge can actually "hear" the DTR/RTS signals from the PC.
Architecture: Added virtual methods for CDC callbacks to the base driver class, allowing the UART bridge to implement them without breaking other drivers.
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Hi
Heres another AI fix, the original dev created a UART bridge that cleverly allowed the Pico to programme the ESP32 however I could never get it to work, however AI added some fixes that worked and now it programmes perfectly. Granted it is a little bit of a niche setup using an ESP32 for the BT side, but there are some uses such as limited space. I had recently designed a PCB that fitted into an old Xbox DVD dongle and a Pico-W was too long so went with the Pico/ESP32 sandwiched either side.
Heres some AI info on what files were changed and why:
The following 7 files contain the complete and verified fix for the ESP32 flashing issue: